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A111939 as a simple table

na(n)
12
23
34
44
56
66
78
88
99
109
1111
1211
1311
1412
1512
1614
1715
1815
1916
2016
2116
2218
2318
2419
2521
2621
2722
2823
2923
3023
3124
3224
3324
3424
3527
3629
3730
3830
3930
4030
4130
4230
4331
4432
4532
4634
4734
4834
4934
5034
5136
5237
5337
5437
5538
5639
5740
5840
5942
6042
6142
6244
6346
6446
6546
6646
6746
6846
6947
7047
7147
7247
7347

[2,3,4,4,6,6,8,8,9,9,11,11,11,12,12,14,15,15,16,
 16,16,18,18,19,21,21,22,23,23,23,24,24,24,24,27,
 29,30,30,30,30,30,30,31,32,32,34,34,34,34,34,36,
 37,37,37,38,39,40,40,42,42,42,44,46,46,46,46,46,
 46,47,47,47,47,47]